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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9150bdd1521d129ca71762f4c54f7aab576daf106d6e8ab3f6ae542278fae271' 
  AND token = 'K95ZQti7InU2+YwF2TvF2HdJGN3gIRavDpn1HpR/m9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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