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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8675aae7df7c8833c390aaa06fde9874933ee0e2d3fffc4cfca762dbeff646b' 
  AND token = 'MBPUo2zUkQPMaOSH2lL8RP30rsGxioiJXPSZ1yl7z34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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