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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98db9f854d3bc66d148719840fc3c6c1eef9f18f40d3945e5a1127c9e157f374' 
  AND token = 'G44LRCKAYs1drmBlJQXf6F9c0RPH5jI6GabrH9wq/4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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