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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecd8f91a3d96bfdda62d5dd736420054d9cfe5542fbf2a9a22276ab6cca487bf' 
  AND token = 'f+57wCKobIoytddJJOquSgmo8R9YQVrWFuh2NwMWxSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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