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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '284c98afc0f1560d0e7bdba48d9b35f4067aad93634bda4a38e9271e0d1bd123' 
  AND token = 'wTXuAXLMAqac8VRsbgE2un7AuMhwRoU1dVUEFwvWhOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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