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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a61a455bd614dd64e7b516b645fbbd90df11651fc2a529b86d31c932a4acf98' 
  AND token = 'mL4pTwHmOyuFNz3NgPXr2h0hh3yNe5OMTiXgqAKfmFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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