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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8aede255590ada5fdf3d021e2824e6ca00b5d6b0cb23aa393d4b1b96f590cb00' 
  AND token = '1pMkpzdbAKLsoOtGFOctKCF/U2lk7QKfX7YDPe/rvh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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