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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f6469a8b5db513b1f508997665fc95aaf9b9f1fa5f95120f358617c1563482e' 
  AND token = '9Klaf9WBtnSg7wNExFI4am9ExrglhMVmMX0qVp+24+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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