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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e5b7a3844eefff08b6a32cc7c4118cc50e108c70901d5216038851c43c99006' 
  AND token = 'gwOy0ObWHkMpe8uJcUgI6Gjo6Na/KsV3Rv6zGTh36AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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