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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dfc0d361603db1196707e460ac2a76504e378a25da392f78efaf4d570e008ca' 
  AND token = 'Jo0nLa9/nNCvw6zwU0uwROR9N+IRBNa2q1vqPXdeBdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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