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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1c1bc941c3d523152b9cef5eac0f13de0ed8bca097cfdf5a0a713c11dd91102' 
  AND token = 'ktN4gDJ9penJGyj0g8vv7Y2mZScATeeFF+zSKCJJOGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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