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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffa4c7bfdbb1c451ad2e80fb60ca71e79e263ab378c48127a764a1d99f21b0b6' 
  AND token = 'hh0SEP8pHK36xT9p9dZ+jn7oqZ1qFWyxMruFvUx5oXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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