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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83d5ba08ad2c6cd5ab2e5e7bce9a675aa99a813de20ff439dbccaac708c527c6' 
  AND token = '8ADEdbhLfkoiaD/w/PUGvgG9D0ODjB1WNrgI2OqLyxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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