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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddfcb38be0b24d3f088e80327f5b341989762266baa3609e846a159420b3ef3e' 
  AND token = 'pUORQDCLi0/r97Yukpj5D9CP7+eHCz+nsFNvDst5nEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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