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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7087d79a0b6ddb59bd2fa4a765b6699be3d75fb135ebec1b29293cf31f376c6e' 
  AND token = 's20bNz/jayCC0w3tsU2eSlvV23YBLO+CMi3vPTpHnuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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