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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27b0e09752d9748e01625268f2726c18fdc36adbe75f7b5f3a4aed788997619c' 
  AND token = 'cHfvD8d77LgXSTEcUELNQM7C9kv4sVlwDCd21VwJIu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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