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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4be39b229928fed4b4af00e9703c92cfc5a327a226f856fc9f5eb899c8663af' 
  AND token = 'WccnAuNBZbF6KNVe7vwC2ebR0NTlYpXR8kC8FFjU8eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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