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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a7e07ebff9d05691584a1cf7cd6c6f27257aae012341a751f234b2dcb449757' 
  AND token = 'cfTEMPen4PM4BkckntVU+w17eapR3aG7nC3ZF0bYwWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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