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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e9093e9eb9b002997f8f68f88905e9cad2ab40ba71ce46df05628c1c6678bc5' 
  AND token = 'SB6BLmLFd1NsqkcLTvJovT1quYPHxffrNlHdHZ/6Pvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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