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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4129d704b021473c3a34518b0f7cff55fc01d4c427a5011548e1d9cfbffc5785' 
  AND token = 'hk7v53bP93xgY8MHgydXywy4JSzp67th4mzc/WaxZVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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