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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d20a0851f917e7e1e638a799827e3b79da003f6ced2ef0cc0eed550237fa90c' 
  AND token = '309VA4lbECoBANpfvoCRnByd3LsExGB+KwgKVqzgkLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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