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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '284814c5021a8431cd8fc479ddf93745f4c87e08c90bd9a1dc9b39b0259dbd8e' 
  AND token = 'Rl5HnDyHIMvbG4vqg++d9OBjc+yegDOq9rm3JJB/Ypc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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