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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '977af627a2b36b4061f4b8f7f4d484d86c4102caaa4801033a14f57745d56c00' 
  AND token = 'Bes2Oke1t/sUsyy78Ojjq9yG2syQDkJafo0ExupwB7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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