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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e2111684cca2d06d13eaea780265a834682e9c0830bc7d3f161a33cd6dcc179' 
  AND token = 'LUHdxw2D6P+tvbXSf6sMHeDxThaAYX0pjmVdE4a7rPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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