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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a76ccbb65f126775b6d2dda67f5daf6c52f5f94270d476c5d68cdc91601f937' 
  AND token = '+sEVUm+7z5SBvj6Rejldp2d9jeDfw56EwXZk9AgOD9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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