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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9184aacf22e9bc9a9d46741efc278c73934f81fb1a7352b25f0235f89f19b3a7' 
  AND token = 'akod/9J5MhDXcmke2EqXgjVMql5XNQoTM3iLaNCija8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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