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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '623676dbb398f7e429a64c430de4355cf26a4182a99e4295ff5ab84391cd3b4c' 
  AND token = 'Hk5PX8jpNYDxBfNRsOYz6Nk3Fidol1cT1DV4X2LX+hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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