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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eb086696402a808c5f68224ba57803f620f6a5302a54e7addc19efccc7914a2' 
  AND token = 'eXwKjrKZewS7aP96mKx4MiERVioc2RR6WEN/R6CiwbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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