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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21247783a1f4e079d1e1c5b347a8a5fd51c88c727699517f5dd75e1937e56c1f' 
  AND token = 'jTt1BMT3KKqgs4euKonTAryiLtCT9L6uszsQsSntbKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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