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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c63db3fb1c9eb6241c8689d2df5f18edfbdc42bceee3ffe1815c135c946ca051' 
  AND token = 'eOR9dlI4vvpMJBDOx2MVGvr+IgVx7XdIwAp226uXv+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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