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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc01ebcc538a59c74ced4bb90ce7c7d1f6fa3fe006f3b780ebcc8b8f49f41d95' 
  AND token = 'Y5+wly0m11i2s8Gu9QX16+OcIDG5Oa528DBoH5Urm5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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