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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06b4dd7baf871167ce815052cacc17fd9d849f51c34f0eb486daf69e2df947a5' 
  AND token = 'cb8HkshuwTmqnSyTO/7Pxb5mOCUnScE0vj3QuXpqnbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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