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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc4cb42f0db3b7a8a64ad6b4ab7eb6919311fb7bd11c8ce8675b355189f42a10' 
  AND token = 'gn0Vk2I0sPqhQcAJHTo+rJYE/Q1qdLf3/IydnX0nAjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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