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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d4f74fd115d79cd19fe2c69698c247bb5844f6f4eb2ef5306e2deb81bea1ea0' 
  AND token = 'cqh+AlhX0XlaWCvttjG65DxPAnaKADtJtjiAhGydOxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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