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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b0ebe54ce70f24dc9cb84d8fd1147d1b980426e403114f1abc98ccab1529922' 
  AND token = 'iJtvXh2QE3gYse+MXwTHt4G3XgIBBC1rCVANvro8vr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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