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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e75fb9696ff79ecfeb2fffde1028a571ce269cd7b78dfc7f3cd8e20ab62986d3' 
  AND token = 'rrxaahLPdyYVMuf2OdCTFjc2bIiIvvHKMWAOygkwAV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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