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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a14dc9ce9575183a80f7c56a8aa0d44c42578bfc71db75efd362675181cc0d97' 
  AND token = 'mek1l9fGWVrQU/Q3HdkBRJ/eAggYMcr6CEGYyUl2SYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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