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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c68566de64e8a00daaf04b477ed2a523a2642f063bd8b032b0ef3bc4dc153d4a' 
  AND token = 'd010EGz5QSL3sEnZc58y290Bo/7mBJ4g7I33SLcscco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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