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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c9e2feb682603758d8a2c4a3e8916754182d28b6d014f673a163d99649508d2' 
  AND token = 'D94NsI9Sf1WXAiZB714jNhOuDd6CYJtcpzKWkp0/8kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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