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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3b596941f03d2e209ac4e0b9492308704ea7b3d1864bec56bb79bf9580473d9' 
  AND token = 'Vb1N4Z4vOlOSf/fWEuXSX9AbQtrwiACWg4h1mlERhPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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