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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a4d769d7fe7958dcca1fc1d7591ccb88aa3ceba4cfd351b6ad51a2c8447e737' 
  AND token = 'VJCOotbh2gSDTPJaKMkKrmi9+ty77+VALQWWb2/HvbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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