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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63e8485c32b466d2f7942ff3507d7f0ead4b15fdfbc1cc73f7103c6f8f9c5b35' 
  AND token = 'DJAEU/Q4ku41zxK109E50vDwnsKUtkLuXLz/d58ahJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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