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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a924d1d67508fdf3e0bb31b754fec336e0404f7e20546fd5628d8af7a67b3e6' 
  AND token = 'IYjGxzHfIeT75gfxnEUXPCi38gOXd2hwUwY+1O2R8xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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