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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc57e4c36509684e6a7ba422addb9daa3253d30b509438e31a7a053f38a12411' 
  AND token = 'CASbcinm9/WUBdcgFyzz2qsf0Z1EPuhIRc80CeYgRSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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