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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af9de374d1da8b4a821d093ad997711cb4478d55bf6fd0b51c861d68404f5fc6' 
  AND token = '2ERpB58a3bhhcCnMDINC1FkJL4rDIGYesQBaQvf5ccw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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