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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5efa576470c76bc625f0c1abb4b905cd69108d1f1e01fb6f2f4360ed93ba05fd' 
  AND token = 'ib5bLMr/v7pGuU444FsytderYcq1BciGqCDYEcu1oVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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