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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cf69638917b044a287bf731ca4eb76bb3de04af521f89e8cbec67a3f7a8f5b4' 
  AND token = 'LsLBnHRlW0muu2ZiPre1ORnMvRKUOt3/QdfE5IqFMMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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