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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29ceab46a630d8d17a8416347a415354697da95926c86834ae677833cbe66513' 
  AND token = 'x8TM+yrTak7/dduEhMDFo14p1w2cbyTgMiYJRuQ7pJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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