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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdbafac5103eb7d43295c0b523d3f2513fde3aede8fb8a0d340588318752fe2b' 
  AND token = 'UN6Vi+EW1dXc9xyqJTOuX1qyHVim61jt6cGU928Zi9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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