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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0616c53ce81ddac1d8380c0eb9289c097cd51ecf3e2ade55bc225725e6eb2a90' 
  AND token = 'v4aqCkj6yH9TYDKE3MMwqF4qg3BD1hVa62UTNMJOwyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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