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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e0bc59454345cca40aa00e1840331bc361fafdcb8e953f682226fe6bef6a367' 
  AND token = 'LbR7XVB3RRqkdKW3uaEdSq2kseAzcKLk3XtPWX0wcqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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