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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '917cd43f4a4d092de31f04537606757f748ce228df976c7d1af5e175af44beab' 
  AND token = 'Spy+Z+fzIXv46XvyIUBMN9dyPZMuGa/hde5uJTRSukA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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