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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da783e33afed6b0d355c9301a44ff0d832d90955d1f2d2f1f20d398243052971' 
  AND token = 'ZMReBbeEM8gd5B0KZnrJOj60aMTI9N7GuTkX31S7wAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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