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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa4352da48b806f814350d3c154153edd4b0860eee0e44d6df3eb2046089d4ab' 
  AND token = '6wTJjAeLNOoV+tr2saYEsxN3W390ZtMv0Q5FcEIbD0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}