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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcf58b79cb59156bcb9a1582325a3a277e37afb4e49e415ed820a81f12bcb354' 
  AND token = 'UNWYlPNTnOgKnuOMktSDDQF4yXrAxUOr33WzDLPp964=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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