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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c4b7b477300834acf39b359d85d082022364f0e4de9fb741132c86bb1e5ef9e' 
  AND token = 'HBdsZiL5Xn/0QdbuqBOxnKKnf7AvRsMiLps4pVaT3nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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