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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37da9337c092bbda623309f27234b77662fc4901d7d90faa90b66211d3aee409' 
  AND token = 'ncXXQcht1pTAowvFl+QrmPXQ8OxfJQZAjcNAzB/bNHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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