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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcb3f4bf945375b3a6779a938e3868ac97290916c5eb1a9e7065fa14e2aa6b86' 
  AND token = 'EtJtMap784ch+IfMpMpyCw8T197OVPQMNzRquomP8Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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